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The chemical in vinegar that makes it sour is acetic acid. Most vinegars are around 5% acetic acid. The rest of the volume is made up of mostly water, and, if it's anything other than white vinegar, there are other acids and chemicals present that contribute to taste, colour, and texture.

If you're asking how to make vinegar, well, acetic acid is produced by the oxidation of ethanol, which is the kind of alcohol found in in wine and beer. Vinegar is traditionally made by introducing acetic acid-producing bacteria into some alcoholic beverage, and allowing it to ferment for several weeks. The brew must then be filtered and purified.

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11y ago

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